The Scenario
You ran an online event last week. Eight hundred people signed up, attended, and gave you their email addresses through a registration form. The post-event nurture sequence is queued in Klaviyo. The only thing between you and that campaign going live is getting those 800 emails into the "Event Attendees 2025" list.
The bad version:
- Save the registration workbook as a CSV, open Klaviyo's list import wizard, upload the file, and find that your "Email Address" header does not match the expected "email" field — save a corrected version and re-upload.
- Step through the field mapping interface and realize two required columns are in the wrong order, requiring another export cycle.
- Wait for the import job to finish, download the results report, and reconcile against the workbook by hand to confirm all 800 were added.
The sequence is sitting idle while you work through an import process designed for someone who does this every day.
The Easy Way: One Prompt in SheetXAI
SheetXAI is an AI agent that lives inside your Excel workbook. It reads the registration data, understands the column layout, and calls Klaviyo's list membership endpoint without you touching the import wizard.
Add all email addresses in column A of this workbook to the Klaviyo list named "Event Attendees 2025", processing up to 1000 at a time and reporting how many were added
What You Get
- Every email in column A is batched into groups of up to 1,000 and submitted to Klaviyo's list-add endpoint.
- A summary note is written into the workbook: how many profiles were added, how many were already members, and whether any rows were skipped.
- The Klaviyo list reflects the new members immediately.
What If the Data Is Not Quite Ready
The VIP rows need to go to a different list
For all rows where column C says "VIP", add those emails from column A to the Klaviyo list with ID abc123; add everyone else to the list named "Event Attendees 2025"
Phone numbers are in the workbook but formatted inconsistently
Add emails from column A to Klaviyo list "Event Attendees 2025" — column B has phone numbers in mixed formats; normalize each to E.164 format before setting the phone_number property on each profile
Attendees are split across two worksheets
Combine the "Day 1" and "Day 2" worksheets — both have email in column A — and add all unique emails to the Klaviyo list "Event Attendees 2025", deduplicating by email before the import
Full cleanup and segmentation in one shot
For all rows in this workbook, normalize the email in column A to lowercase, deduplicate, then add rows where column C is "VIP" to Klaviyo list "VIP Attendees" and all other rows to "Event Attendees 2025", writing the assigned list name into column D for each row
The list is populated before the post-event sequence window closes.
Try It
Get the 7-day free trial of SheetXAI and open the Excel workbook where your event registration data lives, then ask it to push those subscribers into Klaviyo. Also check out how to export campaign performance metrics or the Klaviyo integration hub.